Formation of paper bags



Dec. 29, 1931. A/PELZ FORMATION OF PAPER mes Filed Oct. 11, 1929 I5Sheets-Sheet 1 gripe/vars Dec.29, 1931. A, PEL 1,839,163

\ FORMATION OF PAPER BAGS Figd Oct. 11. 1929 s Sheets-Sheet I 2 17 O 19r17 4 v g v XXII lz vuewroe:

5) Won Patented Dec. 29, 1931 UNITED STATES PATENT OFFICE ALFONS PELZ,OF OPPELN, GERMANY FORMATION OF PAPER BAGS Application filed October 11,1929, Serial No. 898,987, and in Germany May 23, 1929.

The formation of a-paper bag, as employed for example for the receptionand transport of cement of a farinaceous nature, and the construction ofa template suitable .for the 5 production of the bag are mutuallydependent, and will therefore be hereinafter described to ether.

The object of the invention is to provide a paper bag consisting of aplurality of sections and particularly suitable for packing finelydivided material and so simply constructed that it may be rapidly formedby means of templates at relatively low cost.

The invention further relates to a device for the production of a paperbag by means of templates. I The paper bag according .to the inventioncomprises a -multi-layer tube (outer bag) having a re-inforcedstrong-bottom edge and an inner bag for directly receiving the materialand freely suspended and protected in the outer bag. A specialde-aerating device according to the invention prevents escape of dust.

The device for producing this bagand similar bags consists of twotemplates so constructed that they facilitate the work which has to becarried out on 'a paper blank made in the form of a tube open at bothsides in order to convert it into a paper bag ready for use, so that incomparatively short time bags may be made accurately and uniformly.

One form of paper bag and device for use in the manufacture thereofaccording to the invention-are illustrated by way of example in theaccompanying drawings in which Figures 1 to 6 illustrate the bag-makingdevice, and

Figures 7 to 24 the paper bag.

The paper bag produced with the aid of the device according to Figures 1to 6 is illustrated in Figures 7 to 22 on a smaller scale than that ofthe device in order to enable the formation of the bag to be followedmore easily.

Figure 1 is a front elevation of the inner template B.

F1gure 2 is a plan view corresponding to re 1. igure 3 is a plan ofthe-outer template A.

after the top flanges have been fol ed in.

es 11 and 12 are an end elevation and plan of the bag after theformation of the side foldsand removal of the templates.

Figures 13 and 14 are similar views to Figures 11 and 12 but show theblank after the production of the valve or ventilating fold and airescape aperture.

Figure 15 is a planview of the bag showing the bottom thereof foldedover or creased.

Figure 16 is a plan view showin the bag after the bottom folded portionas been turned back again to its original position, partly severed andre-folded. v

Figure 17 is a plan view of the be after the/latter has been turned overand t e bot- 7 tom cemented or glued.

Figure 18 is a plan view showing the bag turned around.

Figure 19 is aplan view showin the bag Figure 20 is a plan view of theba after the fold has been made to assume its ormer position and afterpartial separation and refolding of the top flanges.

Figure 21 is a plan view showin the bag 35 after being turned over andafter g ueing of the top flanges. I

Figure 22 is a sectional elevation on an enlarged scale on the lineXXIIXXII ofli ure 21. v

Figure 23 is a perspective view of the open filling valve, and uncoveredde-aerating apertures.

Figure 24 is a perspective view of the closed filling valve and coveredair vents.

The device for producing a bag consists of a pair of templates an outertemplateA Figures 3 to 6, and an'inner template B Figures 1 to 2.

The outer template A is a rectangular plate to the longitudinal edges ofthe plate 1, whilst a flap 4 1s hinged the end or transverse of theplate.

5 other flaps are hinged to the longitudinal free edge of flap 4. Thelarger of said additional flaps is designated and the smaller 6.

The vertical dimensions of'the flaps 4, 5 espect to their hinge axes areso proportioned relatively to one another that the flan 6 after beingturned through 180 about the common hinge pin from its position shown inFigure 4 assumes the position ll indicated in Figure 5 between thetwohinge pins of the flap 4. All the flaps have rolls or beads along theirfree edges in order to prevent the paper being damaged by sharp edges.The inner template B is also of substantially I0 rectangular form, butthe corner 7 by which the filling opening the bag is formed is cut away,and for the purpose of reducing the wei ht of the template apertures 8and 9 are m e. Steel plate springs 11 and 12 are p 85 riveted to thealuminium plate as shown in Figure 2 and are provided with upwardlyinclined limbs. Plates 13 and 14 hereinafter called wings are riveted tothese limbs of the plate springs; these are shown in a horizontal '0position in Figure 2. A bar 15 is arranged on the flank 14 at thecut-away end of the plate 10 and is stifiened by a strut 16.

The outer edges of the inner template B are also rolled in order toavoid sharp edges. 88 A paper tube or blank shown in Figures 7 and Sismade into a finished bag as illustrated in Figure 21 by means of thesetemplates A and, B.

For this purpose the inner template B is inserted in the paper tube 17(Figures 9 and 10), with the tube against the bar 15 and the tube islaid flat on the late 1 resting on the work bench so that t e template Bbears with its bar 15 against the upstanding a part 18 of the plate 1.The flaps 2, 3 are previouselg spread out. The tube 17 which is positionat one end by the bar 15 may have its other end projecting over theopposite edge of the plate 1 which is made of small dimen- 5. sions forthe purpose of making it as light as possible.

The hand and the flap 3 with the right hand and they are then bothturned through 180 against the tensed parts of the tube betweenthe'plate 10 and the flank pieces 13 and 14. The tube and the wings 13and 14 are thereupon pressed down'flat with the result that thelongitudinal folds 19 visible infigurc 11 a are formed in the tube. Assoon as the person making the bag releases his hold on the flaps, afterthe side folds have been made, the

wings 11, 12, 13 and 14 upwardly agam- Q5 The creases so produced arestroked firmly,

flap is now grasped with the left and by simply pressing the rightforward corner of the tube with the right hand between the inclinedcorners 7 of plate 10 and which passes through all the layers is formedby means of a punch.

The inner template B is then withdrawn from the tube, the flap 6 isbrought into the position shown in figure 5, and the large flap 5 isturned into a perpendicular position. The tube end is then broughtagainst the flap 5 whereupon the latter is pressed down von the tube asindicated in dotted lines in the same figure.

The group of flaps 4, 5, 6, together with the end of the tube grippedthereby are now turned through 180 about the pin by which the flap 4 ishinged to the part 18 of the plate 1, whereby this end of the tube iscreased, Figure 15, at a distance from the end of the tube determined bythe width of the flap and then freed by turning back the flaps.

As in practice the paper tube consists of several layers for example, asis assumed'in Figures 16, 22, three tubes, two layers of the tube arecut with a knife at both small sides up to the crease, provided withadhesive, and folded, and the folded strips adhere in such a manner thatthe bag, Figure 17 receives the cross section diagrammatically shown inFigure 22 in which an inner bag 20 is independently and freely suspendedwithin the double layer outer bag 21, the layers of which are stucktogether along their edges and thus form four layers which, in(3011]11110131011 with the adhesive, give great tenacity or strength tothe bottom of the bag.

The bag is now turned end for end from the position in Figure 16 intothe position shown in Figure 17 and then into the osition indicated inFigure 18. It is then piziced with its front end, previously the rearend,

against the upstanding flap 6, which is in the position shown in Figure6. The flap 6 is then turned into the dotted position and together withthe flap 4 is turned through 180 about the hinge pin. of the latter onthe edge 18, whereby this end of the tube is also creased, but at adistance from the tube end determined-by the width of the flap 6. The

fold produced is of shallowdepth, Figure 19, I

with the result that in the mass productlon of the bags large economy inpaper is effected.

After this, the tube is stroked firmly, cut,

glued, tucked-in and pressed flat as above described and thus a bag withends having the cross section shown in Figure 22 is produced ready forimmediate use after drying. The drying is completed in anextraordinarily rapid manner because all the places provided withadhesive are on the outside, and are consequently readily accessible tothe air. As the piercer of the above mentioned punch passes memesthrough all the layers of paper gripped thereby, sufiicient provisionismade for escape of air, the airvents 22 being so small, that they donot allow of escape of dust.

When after the ba has been filled, the filling tube nozzle is wit rdrawnfrom the filling opening, Figure 23, the filling material raises thevalve surfaces 23, 24, whilst the two surfaces 25 disposed above themapproach them until the imperforate surfaces- 23, 24 register with thetwo perforated surfaces 25 and is this position, Figure 24 closes theair escape" aperture 22. In order that the closing operation can beclearly followed from the drawings, the edges of the bag and the closingvalve well defined in Figure 23, and the still more or less visibleedges in Figure 24 and also the positions of the edges which disap- Ipear in the stretching of the paper caused by the expansion of the bagunder the influence of the filling are provided with one and the samereference letters.

1. A folding device for the manufacture of paper bags by hand comprisingan inner template for acting on the interior of a paper tube to befolded mto a bag, and a separate outer template for acting on theexterior of sail piper tube.

eans comprlsing an inner template 1 for acting onthe interior of a papertube to be formed intoa bag, an outer template for acting on theexterior of said paper tube, and

elements hinged to the longitudinal edges of said outer template forproducing lateral creases in said tube.

3. Means comprising an inner template for acting on the interior ofapaper tube to be formed into a bag,.an outer template for acting on theexter or of said paper tube and an element hinged to one transverse edgeof said outer template for creasing each end of the pa er tube in turn.

4. eans comprising an inner template for acting on the interior of apaper tube to be formed into a bag, an outer template for acting on theexterior of said paper tubes, elements hinged to the longitudinal edgesof said outer template for producing lateral creases in said tube, andan element hinged to one transverse edge of said outer template forcreasing each end of the paper tube in turn. I f I p I I 5.. Meanscomprising an inner tem late for acting on the interior of a paper tu eto be formed into a bag, an outer template for acting on the exterior ofsaid paper tube, an element hinged to one transverse edge of said outertemplate forcreaSing each end of the pa er tube in turn, and twosuperposed flaps hinged to the free longitudinal edge of said hingedelement for creasing the bag containing the filling valve and theopposite end of said bag respectively.

v6. Means compnsmgan inner template for acting on the interior of apaper tube to be formed into a bag, an outer template for acting on theexterior of said paper tube, a

relatively shallow plate extending substantially (perpendicularly from atransverse edge of sai outer template, an element hinged to the freelongitudinal edge of said shallow plate, and two super osed flaps hingedto the free longitudinal e" ge of said hinged element, the height ofsaid shallow plate being such as to accommodate the hinged element lytherefrom.

8. Means comprising an inner tem late for acting on the interior of apaper tu to be formed into a bag, an outer template for acting on theexterlor of said paper tube, and an abutment member bounding one endedge of said inner template.

9. Means comprising an inner template for acting on the interior of apaper tube to be formed into a bag, an outer template for acting on theexterlor of said paper tube, resilient wing elements mounted on bothsides of the longitudinal axis of said inner temlate and extendingupwardly and outwardy therefrom, and an abutment member bpunding one endedge of said inner temp ate. p

In testimony whereof I have signed my name to this'specification. ALFONSPELZ.

